Re: Swing uses bad features
On Sat, 10 Jun 2006 13:05:44 +0100, Chris Uppal wrote:
Owen Jacobson wrote:
I find it somewhat surprising that Java allows virtual dispatch before
initialization is complete.
I'd say there are swings and roundabouts here. I find it quite irritating in
C++ when I'm unable to specialise initialisation using normal virtual method
calls.
Yeah. I think it's more a matter of what you're used to. Both approaches
are valid, and as you point out the Java approach may be way easier to
implement in the JVM.
It'd make more sense if, during the constructor, virtual dispatch was
suspended and only methods defined in the class or its parents could be
invoked.
Do you have a suggestion for how that could be implemented efficiently
(remembering that vtables are not the implementation strategy of choice) ?
Of course not. That makes far too much sense. :) Out of curiousity, how
*are* methods dispatched by the JVM? It's obvious that an offset-based
vtable would make no sense; it'd break as soon as a parent class was
recompiled, which demonstrably doesn't happen. I assume it's similar to
a system where each object has a pointer to its class, which in turn has
an associative table from method signatures to method implementations.
Owen